Sodium hydride → tert-butyl(S)-5-(tert-butyldiphenylsilanyloxy)-2-(diethoxyphosphoryl)-4-methylvalerate

HRID 1436143Notes

Reaction equation

HRID 1436143 reaction equation
[CH2:1]([O:3][P:4]([CH2:9][C:10]([O:12][C:13]([CH3:16])([CH3:15])[CH3:14])=[O:11])([O:6][CH2:7][CH3:8])=[O:5])[CH3:2].[H-].[Na+].Br[CH2:20][C@H:21]([CH3:41])[CH2:22][O:23][Si:24]([C:37]([CH3:40])([CH3:39])[CH3:38])([C:31]1[CH:36]=[CH:35][CH:34]=[CH:33][CH:32]=1)[C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1>C1COCC1>[Si:24]([O:23][CH2:22][CH:21]([CH3:41])[CH2:20][C@H:9]([P:4]([O:3][CH2:1][CH3:2])([O:6][CH2:7][CH3:8])=[O:5])[C:10]([O:12][C:13]([CH3:14])([CH3:16])[CH3:15])=[O:11])([C:37]([CH3:38])([CH3:39])[CH3:40])([C:31]1[CH:32]=[CH:33][CH:34]=[CH:35][CH:36]=1)[C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1

Participants

5

Reactant 3

HCID 24758Sodium hydrideHCID 2773685tert-Butyl diethylphosphonoacetateHCID 69007455((R)-3-bromo-2-methylpropoxy)-tert-butyldiphenylsilane

Product 1

HCID 86612619tert-butyl(S)-5-(tert-butyldiphenylsilanyloxy)-2-(diethoxyphosphoryl)-4-methylvalerateYield 52.2%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent3×

Procedure

A solution tert-butyl diethylphosphonoacetate (64 g) in THF (100 mL) was added dropwise to a suspension of sodium hydride (containing 40% mineral oil, 13.2 g) in THF (400 mL) under ice-cooling, and the reaction mixture was stirred at room temperature for 75 minutes. A solution of ((R)-3-bromo-2-methylpropoxy)-tert-butyldiphenylsilane (99.4 g) in THF (100 mL) was added dropwise to the reaction mixture, which was then heated under reflux for 23 hours. Ice water was added to the reaction mixture, followed by extraction with ethyl acetate. The organic layer was washed with brine, dried over anhydrous magnesium sulfate, and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography (elution solvent: heptane-ethyl acetate system) to obtain 74.6 g of the title compound. The property values of the compound are as follows.

Workup

  1. temperaturecooling
  2. temperaturewas then heated
  3. temperatureunder reflux for 23 hours
  4. extractionfollowed by extraction with ethyl acetate
  5. washThe organic layer was washed with brine
  6. dry with materialdried over anhydrous magnesium sulfate
  7. concentrationconcentrated under reduced pressure
  8. customThe residue was purified by silica gel column chromatography (elution solvent: heptane-ethyl acetate system)

Sources & evidence

ORD record
ord-1654b09c28da4899893691a459f8fdb1
Source dataset
uspto-grants-2009_11
Patent number
US07618960B2

Reaction notes

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